mds@gbnet.net (mark) writes:
What I'm thinking of is that AFAICR tcp_xmit_hiwat and tcp_recv_hiwat are set to 8192 (bytes) and the equivalent *lowat's to 2048. This is
We're using this on our 2x400 MHz E450's and we see ~60MB/s using switched gigabit.
ndd -set /dev/ge adv_1000fdx_cap 1 ndd -set /dev/ge adv_1000hdx_cap 0 ndd -set /dev/ge adv_1000autoneg_cap 0 ndd -set /dev/ge adv_pauseTX 0 ndd -set /dev/ge adv_pauseRX 0 ndd -set /dev/tcp tcp_recv_hiwat 262144 ndd -set /dev/tcp tcp_xmit_hiwat 262144 ndd -set /dev/tcp tcp_xmit_lowat 2048 ndd -set /dev/tcp tcp_wscale_always 1 ndd -set /dev/tcp tcp_tstamp_always 1 ndd -set /dev/tcp tcp_rexmit_interval_max 60000
Note these are dedicated backup servers, so the very high tcp_X_hiwait may not be appropriate if you're not doing lots of bulk data transfer.
The tcp_tstamp_always is a big win.
Darrell